Unicorn speedup

Added two development gems, better_errors and rack-mini-profiler for page load time. 

The next gem I added was unicorn and setup a pretty standard unicorn.rb config file. You can tweak increase/decrease worker processes depending on load. I set it to 4 which is default these days.

Just by using unicorn I was able to speed up page load time. 

Without Unicorn:
![Web Brick](http://content.screencast.com/users/amanelis/folders/Jing/media/62f12291-68b0-451e-bacd-d0986de6ce6f/00000095.png)

With Unicorn:
![Web Brick](http://content.screencast.com/users/amanelis/folders/Jing/media/282fc963-d355-4270-8feb-3472a094e8a7/00000096.png)

This should run substantially faster in production.